N-methyl-2-pyrrolidone → HCID 135593826, compound

Participants

Reaction Conditions

Reaction Steps

126 g of the sodium salt of 3-[5-hydroxy-8-(2-methylsulphonyl-4-nitrophenylazo)-naphthylsulphamoyl]-benzene sulphonic acid are stirred in 700 ml of phosphorus oxychloride and heated to 60° C. At this temperature 20 g of N-methylpyrrolidone are gradually added, whereupon the mixture is stirred at 60° C. for 6 h and thereafter allowed to cool. The precipitate formed is filtered with suction, washed with dichloroethane and dried.

Provenance & Evidence